2010-03-03 13:22:04 +00:00
|
|
|
/* RSLms - GSM 08.58 like protocol between L2 and L3 of GSM Um interface */
|
|
|
|
|
|
|
|
/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
|
|
|
|
*
|
|
|
|
* All Rights Reserved
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License as published by
|
|
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
|
|
* (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public License along
|
|
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
|
|
*
|
|
|
|
*/
|
2010-03-01 22:54:32 +00:00
|
|
|
|
|
|
|
#include <stdint.h>
|
|
|
|
#include <errno.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
|
|
|
|
#include <osmocore/msgb.h>
|
|
|
|
#include <osmocore/rsl.h>
|
|
|
|
#include <osmocore/tlv.h>
|
|
|
|
#include <osmocore/protocol/gsm_04_08.h>
|
2010-03-02 22:02:16 +00:00
|
|
|
|
2010-03-27 00:56:05 +00:00
|
|
|
#include <osmocom/logging.h>
|
2010-03-01 22:54:32 +00:00
|
|
|
#include <osmocom/lapdm.h>
|
2010-03-02 22:02:16 +00:00
|
|
|
#include <osmocom/rslms.h>
|
|
|
|
#include <osmocom/layer3.h>
|
2010-03-01 22:54:32 +00:00
|
|
|
#include <osmocom/osmocom_data.h>
|
2010-03-03 13:22:04 +00:00
|
|
|
#include <osmocom/l1ctl.h>
|
2010-03-01 22:54:32 +00:00
|
|
|
|
2010-03-02 22:02:16 +00:00
|
|
|
/* Send a 'simple' RLL request to L2 */
|
|
|
|
int rslms_tx_rll_req(struct osmocom_ms *ms, uint8_t msg_type,
|
|
|
|
uint8_t chan_nr, uint8_t link_id)
|
2010-03-01 22:54:32 +00:00
|
|
|
{
|
2010-03-02 22:02:16 +00:00
|
|
|
struct msgb *msg;
|
2010-03-01 22:54:32 +00:00
|
|
|
|
2010-03-04 11:00:29 +00:00
|
|
|
msg = rsl_rll_simple(msg_type, chan_nr, link_id, 1);
|
2010-03-01 22:54:32 +00:00
|
|
|
|
2010-03-02 22:02:16 +00:00
|
|
|
return rslms_recvmsg(msg, ms);
|
2010-03-01 22:54:32 +00:00
|
|
|
}
|
|
|
|
|
2010-03-02 22:02:16 +00:00
|
|
|
/* Send a RLL request (including L3 info) to L2 */
|
|
|
|
int rslms_tx_rll_req_l3(struct osmocom_ms *ms, uint8_t msg_type,
|
|
|
|
uint8_t chan_nr, uint8_t link_id, struct msgb *msg)
|
2010-03-01 22:54:32 +00:00
|
|
|
{
|
2010-03-04 11:00:29 +00:00
|
|
|
rsl_rll_push_l3(msg, msg_type, chan_nr, link_id, 1);
|
2010-03-01 22:54:32 +00:00
|
|
|
|
2010-03-02 22:02:16 +00:00
|
|
|
return rslms_recvmsg(msg, ms);
|
2010-03-01 22:54:32 +00:00
|
|
|
}
|
|
|
|
|
2010-06-20 21:02:40 +00:00
|
|
|
static int ccch_enabled = 0;
|
2010-03-01 22:54:32 +00:00
|
|
|
static int rach_count = 0;
|
|
|
|
|
|
|
|
static int rslms_rx_udata_ind(struct msgb *msg, struct osmocom_ms *ms)
|
|
|
|
{
|
|
|
|
struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
|
|
|
|
struct tlv_parsed tv;
|
|
|
|
int rc = 0;
|
|
|
|
|
2010-03-27 00:56:05 +00:00
|
|
|
DEBUGP(DRSL, "RSLms UNIT DATA IND chan_nr=0x%02x link_id=0x%02x\n",
|
2010-03-01 22:54:32 +00:00
|
|
|
rllh->chan_nr, rllh->link_id);
|
|
|
|
|
|
|
|
rsl_tlv_parse(&tv, rllh->data, msgb_l2len(msg)-sizeof(*rllh));
|
|
|
|
if (!TLVP_PRESENT(&tv, RSL_IE_L3_INFO)) {
|
2010-03-27 00:56:05 +00:00
|
|
|
DEBUGP(DRSL, "UNIT_DATA_IND without L3 INFO ?!?\n");
|
2010-03-01 22:54:32 +00:00
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
msg->l3h = (uint8_t *) TLVP_VAL(&tv, RSL_IE_L3_INFO);
|
|
|
|
|
2010-06-20 21:02:40 +00:00
|
|
|
if (rllh->chan_nr == RSL_CHAN_PCH_AGCH) {
|
2010-03-01 22:54:32 +00:00
|
|
|
rc = gsm48_rx_ccch(msg, ms);
|
2010-06-20 21:02:40 +00:00
|
|
|
ccch_enabled = 1;
|
|
|
|
} else if (rllh->chan_nr == RSL_CHAN_BCCH) {
|
2010-03-22 00:26:04 +00:00
|
|
|
rc = gsm48_rx_bcch(msg, ms);
|
2010-06-20 21:02:40 +00:00
|
|
|
if (ccch_enabled && (rach_count < 2)) {
|
2010-03-01 22:54:32 +00:00
|
|
|
tx_ph_rach_req(ms);
|
|
|
|
rach_count++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int rslms_rx_rll(struct msgb *msg, struct osmocom_ms *ms)
|
|
|
|
{
|
|
|
|
struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
switch (rllh->c.msg_type) {
|
|
|
|
case RSL_MT_DATA_IND:
|
2010-03-27 00:56:05 +00:00
|
|
|
DEBUGP(DRSL, "RSLms DATA IND\n");
|
2010-03-03 13:37:31 +00:00
|
|
|
/* FIXME: implement this */
|
2010-03-01 22:54:32 +00:00
|
|
|
break;
|
|
|
|
case RSL_MT_UNIT_DATA_IND:
|
|
|
|
rc = rslms_rx_udata_ind(msg, ms);
|
|
|
|
break;
|
|
|
|
case RSL_MT_EST_IND:
|
2010-03-27 00:56:05 +00:00
|
|
|
DEBUGP(DRSL, "RSLms EST IND\n");
|
2010-03-03 13:37:31 +00:00
|
|
|
/* FIXME: implement this */
|
2010-03-01 22:54:32 +00:00
|
|
|
break;
|
|
|
|
case RSL_MT_EST_CONF:
|
2010-03-27 00:56:05 +00:00
|
|
|
DEBUGP(DRSL, "RSLms EST CONF\n");
|
2010-03-03 13:37:31 +00:00
|
|
|
/* FIXME: implement this */
|
2010-03-01 22:54:32 +00:00
|
|
|
break;
|
|
|
|
case RSL_MT_REL_CONF:
|
2010-03-27 00:56:05 +00:00
|
|
|
DEBUGP(DRSL, "RSLms REL CONF\n");
|
2010-03-03 13:37:31 +00:00
|
|
|
/* FIXME: implement this */
|
2010-03-01 22:54:32 +00:00
|
|
|
break;
|
|
|
|
case RSL_MT_ERROR_IND:
|
2010-03-27 00:56:05 +00:00
|
|
|
DEBUGP(DRSL, "RSLms ERR IND\n");
|
2010-03-03 13:37:31 +00:00
|
|
|
/* FIXME: implement this */
|
2010-03-01 22:54:32 +00:00
|
|
|
break;
|
|
|
|
default:
|
2010-03-27 00:56:05 +00:00
|
|
|
LOGP(DRSL, LOGL_NOTICE, "unknown RSLms message type "
|
|
|
|
"0x%02x\n", rllh->c.msg_type);
|
2010-03-01 22:54:32 +00:00
|
|
|
rc = -EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
2010-05-22 10:46:20 +00:00
|
|
|
msgb_free(msg);
|
2010-03-01 22:54:32 +00:00
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2010-03-02 17:47:01 +00:00
|
|
|
/* input function that L2 calls when sending messages up to L3 */
|
2010-04-05 11:26:09 +00:00
|
|
|
static int layer3_from_layer2(struct msgb *msg, struct osmocom_ms *ms)
|
2010-03-01 22:54:32 +00:00
|
|
|
{
|
|
|
|
struct abis_rsl_common_hdr *rslh = msgb_l2(msg);
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
switch (rslh->msg_discr & 0xfe) {
|
|
|
|
case ABIS_RSL_MDISC_RLL:
|
|
|
|
rc = rslms_rx_rll(msg, ms);
|
|
|
|
break;
|
|
|
|
default:
|
2010-03-03 13:37:31 +00:00
|
|
|
/* FIXME: implement this */
|
2010-03-27 00:56:05 +00:00
|
|
|
LOGP(DRSL, LOGL_NOTICE, "unknown RSLms msg_discr 0x%02x\n",
|
|
|
|
rslh->msg_discr);
|
2010-05-22 10:46:20 +00:00
|
|
|
msgb_free(msg);
|
2010-03-01 22:54:32 +00:00
|
|
|
rc = -EINVAL;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
2010-04-05 11:26:09 +00:00
|
|
|
|
|
|
|
int layer3_init(struct osmocom_ms *ms)
|
|
|
|
{
|
|
|
|
return osmol2_register_handler(ms, &layer3_from_layer2);
|
|
|
|
}
|